Quote Originally Posted by Richard K View Post
Don't have a gold star. Anyone know if a passport card is acceptable?
Passport card is valid federal photo ID within the US, and for entry "from Canada, Mexico, the Caribbean, and Bermuda at land border crossings or sea ports-of-entry" It is not valid for international air travel.

I used my passport card on a Caribbean sea cruise with no problems, but had I attempted to fly back from say, Cancun with just the passport card, I would have been refused boarding on the international flight. I did use the passport card as my ID to board my domestic flight from the Springs to New Orleans where I was getting on the cruise ship.